153 citations
- Sobolev Institute of MathematicsRU3 papers
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Showing 2008Show all
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math.CO2008
Rationality, irrationality, and Wilf equivalence in generalized factor order
Sergey Kitaev, Jeffrey Liese, Jeffrey Remmel +1
Let be a partially ordered set and consider the free monoid of all words over . If then is a factor of if there are words with . D…
math.CO2008
Obtainable Sizes of Topologies on Finite Sets
Kari Ragnarsson, Bridget Eileen Tenner
We study the smallest possible number of points in a topological space having k open sets. Equivalently, this is the smallest possible number of elements in a poset having k order…